According to MayoClinic.org, "yoga is a mind-body practice that combines physical poses, controlled breathing, and meditation or relaxation. Yoga may help reduce stress, lower blood pressure, and lower your heart rate. And almost anyone can do it." Yoga is not just for mental fitness, it's for physical fitness, too. It is suitable for all ages, providing flexibility and balance in addition to functional fitness. And no, you don't have to be able to bend into a pretzel to do yoga.
SCCLD provides free videos to stream through many databases. One, OverDrive Video, provides 25 different videos on various types of yoga including yoga for beginners, prenatal yoga, yoga for specific health issues, and 'schools' of yoga such as Ashtanga yoga. Go directly to the list of yoga videos with this link. You can watch a sample of each video before deciding which one(s) to borrow for 3, 5, or 7 days. (Yoga mat not provided. ?)